Cylinder type fumigating applicator



Juiy 14, 1931. c. D. COLLINS- CYLINDER TYPE FUMIGATING APPLICATOR Filed Aug. 25, 1928 3 RAMS?" .Y W M M FL 5 e 9/\ a o m w n m p. w W 7 5 3 u xx 3 a INVENTOR HARLES Conn" 5 ATTORNEY x 7 2 $15,455,!55 4 u l 4 1 w 5 w M 0 O Q I. 9 A\// g i\\\ E ii A- w E g- 0 Q a Ms i 8 2 2 Z V E 9.. W. H E

Patented July 14, 1931 UNITED STATES PATENT OFFICE CHARLESD. COLLINS, OF NEW YORK, N. Y., ASSIGN'OR TO AMERICAN CYANAMID COM- IPANY, OF YORK, N. Y., A CORPORATION OF MAINE CYLINDER TYPE FUMIGATING APPLICATOR Application filed August 23, 1928. Serial No. 301,449.

The principal object of the invention is the provision of a device of the above type which will definitely measure or limit the dosage per stroke, whereby the operator may know the amount of fumigant applied.

Another important objectof this invention is the arran 'ement of parts in such an manner that lea age of the fumigantin an accidental manner will be avoided. As above stated, the fumigant maybe liquid hydrocyanic acid, a very poisonous material to use, and it is, therefore, necessary and desirable that any device adapted for its use be absolutely fool proof.

It is also an important consideration in applications of this kind that no leakage should occur in case thedevice is tipped over.

To this end the invention consists in providing a container for the liquid to be dispensed, which contain-er comprises two definite compartments. Thelower compartment is used to hold the liquid fumigant, and the upper chamber or compartment the manually operable means whereby the fumigant. may be ejected from the container proper. The upper portion of the device is provided with a cover so that the operating mechanism may be readily locked, and accidental or unauthorized manipulation thereof prevented.

Carried by a division wall separating'the two above mentioned compartments, a pump of cylindrical form is provided in which'th'e plunger used to draw the desired amount of liquid from the reservoir proper into the pump itself and also to eject the same from the pump, comprises a cylindrical element fitting, the pump barrel and reciprocable therein. This plunger" may conveniently comprise two concentrically arranged tubes, the inner tube of which is used as the exit tube for the liquid within the reservoir. Attached to the top of the outer tube of the plunger is a handle mechanism whereby the same may be manipulated. The end of the exit or inner tube of the plunger terminates in a fixture directly below the handle to which is attached the hose and conventional nozzle arrangement. 7

Suitable one way valves, and fixtures through which the material may be introduced into the main reservoir and the excess emptied therefrom, are carried, by the division plate between the reservoir proper and the manipulating section."

On the outside of the cylinder comprising.

the device, means for definitely limiting the stroke of the plunger, are provided. This means may conveniently comprise a slidable slotted link. 'In the preferred form the lower portion of the link is arranged within 'a casing on the cylinder proper, and means are provided for elevating the link to any desired heightout ofits casing. ,The handle on the top of the plunger of the pump is provided with an extension projecting into the,

slot of the link so that the upstroke of the plunger will be limited by the position of the link.

Means are also provided on the link, whereby it may be raised to its maximum vertical height, and the amount of liquid 'fumigant ejected by manipulation of the handle,-indicated by notches or divisions on the link as the plunger moves downward.

The invention further consists in the novel.

arrangement combination, and construction of parts, more fully, hereinafter described and pointed out in the accompanyingdrawings. In these drawings:

Fig. 1 is a sectional elevation of a device.

embodying my invention.

Fig. 2 is a sectional view along the line 22ofFig. 1. g o

' Fig. 8 is adetail of the slidable link.

Referring now with particularity to the embodiment illustrated, I have shown at 1, a capsule shaped tank or reservoir for the liquid fumigant having a depending sleeve 2 secured thereon by any desirable method.

The bottom of the sleeve 2 is preferably rolled as at 3 for strength and also to provide a firm support for the entire device.

To the upper portion of the reservoir or container 1, a sleeve l, is attached, having certain apertures therein through which the various parts of the mechanism are available.

unauthorized or accidental use of the device.

The cap or top 5 may be supplied with a handle 8 so that the apparatus may be readily transported or carried thereby.

The dividing plate .9, is secured to the top of the container 1, and to-the underside thereof, I secure as by welding or the like, the half coupling 10, carrying a fixture 11, threaded at its lower portion to the pump barrel 12. This barrel extends down to near the bottom of thecontainer and carried on its end a cage element 13, adaptedto contain the ball valve 14 in seat 15. Between the end of the barrel 12, and the cage 13, a plate 16 ,isjlocate'dywhich has an offset 17 limiting the upward movement .of the ball .14.

Interiorof the pump barrel 12 is the plunger 18, which. comprisesa substantially cylind-ri cal element attached at the top to the frame :19 of the .handle 20. The bottom of ,the plunger tube 18 is closed by the plug 21.

Packing 22 located between the plunger 18 and the fixture l'Leffectively prevents escape -fiuid between the parts. The nut 23,

threaded to the fixture 1 1, inconnection with the element 24,,ma1ntains the packing 22 undercompression in the usual manner. IV-ithin thepump plunger 18, and arranged concentrically therewith is an inner exit tube 25., secured .at its lower end in the plug 21,

*at the .bottom ofthe plunger tube 18, andat the upper end to Y coupling 27. Into this part 27 there is secured a .pressure gauge 28 .and :the .end of the flexible tube 29 which marries thelconventienal spray gun 30,

It will .thus be seen that in manipulating the device, the handle 20 in'its upward stroke causes the .ball valve 14 to be unseated and a (quantity of liquid material from inside "the container to bedrawn into .thecage 13, and

inside the pump barrel 21. This action centinues .as long as the handle 20 moves in an upward direction. then reversing the direction ofmovement-ofthehandle the ball valve 14 rests on its seat 15 and the liquid .thus trapped within the pump barrel '21 will be forced up the exit tube 25 and intothe'flexible tube 29, and finds its way throughthe spray -gun 30. 1

Suitably secured to the outside of the device is a guard elementor-casing, 31, within which-slides a link,.32. This link is provided with a slot, '33, extendingsubstantially the entire length thereof. The'link-is so arranged with relation to the handle proper that an extension, 34, of the handle, passes through the slot 33 of the link, and a -washer, '35, and ,pin 36,, prevents accidental displacement of the handle-extension 34, from the link 32.

The knurled nut, 37, may be manipulated to a plug 46.

maintain the link 32 in any desired vertical position between its minimum and maximum elevation.

In order to definitely indicate to the op erator the amount of fumigant ejected by a certain stroke of the handle, I provide a series of notches, 38, on one side of the link, 32, and cooperating with these notches is a spring pressed dog or latch, 39, carried on the side ofithe guard 31. By backingolf the knurled nut, 37, the link 32 may be raised and spring latch, 39, made to engage any desired notch as the link is raised at any point, indicating to the operator that certain definite units of volume have been ejected by the downstroke of the plunger to that point.

It may be desirable in some instances to raise .the link 32, to'its maximum vertical position and provide notches 40, on one inner side :of the slot .38, so that as the :handle 20 is moved down, the extensions 34 on the handle will engage a notch 40 and thus indicate at that time to the operator that a certain definite quantity .otmaterial .has been ejected through the ,nozzle30. In this way, theloperator will then know, even though manipulating-the device in the dark, just how much fumigant has been ejected. Obviously the parts are flexible enough so that slight pressure .of the handle toward that side of the link carrying the notches 40 will cause the part 34 to ride into the .notch 40 and thus indicate its position to the operator.

In order ;to fill the device with thedesirec amount of liquid fumigant I provide an illlet fixture 41, carried in the division plate 9,. This fixture may consist conveniently of a standard T coupling carrying at the top thereof the ordinary Schrader air valve. This .air valve is indicated generally at 42. A screw plug 43 is used to close the T fixture after filling.

On the other side of the plate .9, I locate what I may .term an emptying :fixture 44 which also comprises a standard T coupling with a'release valve 45 .atthe top thereof.

This valve is ofthe ordinary type to release air pressure within the-reservoir whenbacked off. The fixture 44 is likewise provided with To fillt-he applicator .Witha fumigant such .as hydrocyanic acid, place the .device .on a scale, attach a transfer hose from a storage reservoir to coupling 41 .after removing plug 43. Removeplug 46 from coupling 44, and attach a .hose so .thatthe end dips intoa :pail of water. The fumigant is then let intothe tank 1 until the scale indicates the proper amount, and the plugs replaced.

l vhenready to .fumigate, air pressure within theeapplicator should be released by trip- :ping the Schrader valve 42, During fumigation, thecap should .be left off this valve so that air may .be admitted .to .replace the liq- -uid pumped out. Setthetlink 32 at the desired height and draw the plunger handle up to the top of the link. Remove the discharge cap and attach the spray hose. One primary stroke is required to fill the hose and gun and to expel the air therein. The extent of this priming stroke will be determined by the length of the hose used, and in most instances this can either be determined by experiment or it will be indicated on the apparatus. After this priming stroke the link can be set to any other charge required and the work proceed with one stroke per charge.

The spray valve should always be held open while pressing down the plunger and after stopping the plunger, the spray valve should be closed to prevent drip.

To clear the hose after fumigation lay the applicator on its side, draw the plunger out an inch, thus allowing the ball valve 14 to open. If the trigger on the spray gun is then tripped the liquid in the hose will run back into the tank.

After the fumigation has been made and the desired quantity of material used, there may remain in the tank 1, some liquid fumigant which it is desirable to replace in the storage reservoir, particularly if the fumi gant is hydrocyanic acid. This may be done by removing the plug 46 and attaching there to a hose to the storage reservoir. The applicator should then be laid on its side and an air pump connected in the usual manner to the Schrader valve 42, and just sufficient pressure pumped into enable all of the liquid material within the tank 1, to flow out of the fixture 44. The plug 46 is then replaced and the Schrader valve cap replaced.

It will thus be apparent that I have provided a fumigator in which no air pressure is required for discharging the liquid hydrocyanic acid gas contained therein. This prevents the building up of pressure within the tank 1, and the accidental discharge of liquid fumigant through the gun 30.

The applicator will readily deliver meas ured quantities of any liquid fumigant placed in the tank, by suitable manipulation of the link 32 and plunger. While but a single stroke of the plunger is necessary to expel a certain amount of the fumigant within the tank, yet obviously any number of strokes may be used, the operator knowing that a definite quantity of fumigant is expelled at each complete stroke.

It is also to be noted that. the particular pump assembly used is of advantage in that there are no leather or other composite washers to dry out or require renewal.

It will also be noted that the entire pump assembly may be readily removed from the device by simply unscrewing the fixture 11, and the mechanism attached thereto. This is desirable for replacement of parts where necessary.

The fact that a tank top or cover 5 has been provided with means for definitely locking the handle 20 in the down'or closed position enables the entire spray or applicatordevice to be transported from place to place without fear of accidental discharge of the very poisonous material therein.

I claim:

A device of the character described comprising a container, a pump extending within the container for withdrawing liquid therefrom, means for limiting the stroke of the pump, said means comprising a vertically adjustable link engaging the pump and a spring latch *engageable with a series of notches on the link, the by the container.

In testimony whereof, I have hereunto subscribed :my name this 17th day of August,

CHARLES D. COLLINS.

latch being carried 

